const createError = require('http-errors');
const express = require('express');
const path = require('path');
const cookieParser = require('cookie-parser');
const logger = require('morgan');
const mongoose = require('mongoose');
const dotenv = require('dotenv');

// 加载环境变量
dotenv.config();

const indexRouter = require('./routes/index');
const usersRouter = require('./routes/users');
const crawlerRouter = require('./routes/crawler');  // 添加新路由
const { startCrawlerSchedule } = require('./scheduleCrawler'); // 导入爬虫调度器

const app = express();

// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'ejs');

app.use(logger('dev'));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));

app.use('/', indexRouter);
app.use('/users', usersRouter);
app.use('/api/crawler', crawlerRouter);  // 注册新路由

// catch 404 and forward to error handler
app.use(function(req, res, next) {
  next(createError(404));
});

// error handler
app.use(function(err, req, res, next) {
  // set locals, only providing error in development
  res.locals.message = err.message;
  res.locals.error = req.app.get('env') === 'development' ? err : {};

  // render the error page
  res.status(err.status || 500);
  res.render('error');
});

// 连接数据库并启动爬虫任务
console.log(`尝试连接数据库: mongodb://${process.env.DB_USERNAME}:${process.env.DB_PASSWORD}@${process.env.DB_HOST}:${process.env.DB_PORT}/${process.env.DB_NAME}`);
mongoose.connect(`mongodb://${process.env.DB_USERNAME}:${process.env.DB_PASSWORD}@${process.env.DB_HOST}:${process.env.DB_PORT}/${process.env.DB_NAME}`)
  .then(() => {
    console.log('成功连接到 MongoDB');
    // 启动爬虫定时任务
    startCrawlerSchedule();
  })
  .catch(err => {
    console.error('MongoDB 连接错误:', err);
});

module.exports = app;